Debugging any regular t and short names
Debugging the any_regular_t type can be problematic if you don't know what the data type of the value stored in it is. To make it simpler for to view an any_regular_t in the debugger, release 1.0.41 contains a four character short name for the type which is stored at the top of the vtable.
The structure of an any_regular_t is a pair of doubles, the first word of the first double contains a pointer to a vtable.
|vtable*||pad (on 32 bit machines)||data or data*|
The first word of the vtable contains a version number on release builds (currently 1) and a short name (a four character constant) on debug builds.